JP2000321016A - Laser beam displacement measuring apparatus for vibration test - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure displacement at the upper part of a housing accurately by projecting a laser beam having straight advance properties and sharp directivity from a laser generator mounted on a shaking table toward a graduation plate fixed to the upper part of the housing. SOLUTION: A rectangular prism housing 2 is placed substantially in the center of a shaking table 1 with the side face of the housing 2 being directed in same direction as the vibrating direction of the shaking table 1. A rectangular planar graduation plate 4 is attached to the upper side of the housing 2 directing the same direction as the vibrating direction X. A laser generator 3 secured movably to the shaking table 1 in the front direction of the graduation plate 4 projects a laser beam 3a having straight advance properties and sharp directivity toward the graduation plate 4. A CCD camera 5 positioned substantially in front of the graduation plate 4 independently from the shaking table 1 records the position of an image 3b with respect to the graduation plate 4. Since the housing 2 vibrates in same direction as the housing 2, vibratory displacement is equalized between them and thereby vibratory displacement of the housing 2 can be measured easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser displacement measuring apparatus for vibration testing, and more particularly to a method for measuring an image of a laser beam emitted from a laser generator attached to a vibration table to a scale plate attached to a housing. The present invention relates to a laser light displacement measuring device for vibration test for measuring a vibration displacement of a housing by measuring a position.

[0002]

2. Description of the Related Art A conventional displacement measuring apparatus for measuring a vibration displacement of a housing or the like in a vibration test will be described with reference to the drawings.
FIGS. 4A and 4B are schematic views of a displacement measuring device at the upper part of a housing in a conventional vibration test, wherein FIG. 4A is a front view and FIG. In the figure, the displacement measuring device is constituted by a displacement measuring column 40, a pointing member 21, and a CCD camera 5, and a rectangular parallelepiped casing 2 has a bottom surface fixed to a vibration table 1 of a vibration test device. . Here, in the vibration test, when the vibration table 1 normally vibrates with the vibration X in the vibration test,
The upper part of the housing 2 vibrates with the vibration table 1 at the vibration X1.

[0003] The displacement measuring column 40 has a ruled shape having a beam 42 protruding at a right angle on an upper portion thereof, and the beam 42 is provided with a scale 41. The beam 42 projects from the vibration table 1 adjacent to the housing 2 so as to be in the same direction as the vibration direction of the vibration X and to be located above the upper surface of the housing 2.

The pointing member 21 has a conical shape and is adhered to the upper surface of the housing 2. Here, scale 41
When viewed from the front, the scale 4
When the pointing member 21 is adhered so that 1 is located, the position of the pointing member 21 with respect to the scale 41 can be easily recognized.

[0005] The CCD camera 5 includes a beam 42 and a pointing member 2.
1 is installed in the front direction separately from the vibration table 1. Therefore, even if the vibration table 1 vibrates with the vibration X, the CCD camera 5 does not vibrate.

[0006] The displacement measuring device configured as described above,
In the vibration test, when the vibrating table 1 vibrates at the vibration X, the upper part of the housing 2 vibrates at the vibration X1 with respect to the vibrating table 1.
Vibrates at In this state, the indicating member 21 and the scale 4
When 1 is recorded by the stationary CCD camera 5 installed separately from the vibration table 1, the pointing member 21 is recorded as if it vibrates at the vibration X + X1.

If the case 2 does not vibrate at all when the vibration table 1 vibrates with the vibration X, the pointing member 21 remains stationary with respect to the scale 41. When the indicating member 21 and the scale 41 in this state are recorded by the CCD camera 5, the indicating member 21 is recorded so as to vibrate with the vibration X.

Therefore, the state of the indicating member 21 and the scale 41 when the vibration table 1 vibrates is recorded by the CCD camera 5, and the position of the indicating member 21 with respect to the scale 41 is measured by performing slow reproduction. The vibration displacement of the body 2 can be measured. As a means for measuring the position of the indicating member 21 with respect to the scale 41 at this time, in a simplified manner, the vibration X + X
It can be measured by reading 1 visually.

[0009]

However, in the displacement measuring device using the displacement measuring column 40 of the above-described conventional example, when the vibration table 1 vibrates, the displacement measuring column 40 vibrates with respect to the vibration table 1. Therefore, for example, when the housing 2 is high, the vibration amplitude of the beam 41 of the displacement measurement column 40 increases, and there is a problem that the vibration displacement of the housing 2 cannot be accurately measured.

As a displacement measuring device, a displacement measuring device composed of a precise optical system can be mounted on the vibration table. However, every time a vibration test is performed, the optical system mounted on the vibration table is required. Specifically, an irregular load is applied to a lens, a beam splitter, and the like, and a displacement measuring device using such an optical system is shifted with respect to vibration because the optical system is a precise optical system. This may cause a risk that measurement may be impossible due to a measurement error.

The present invention has been made in order to solve the above-mentioned problem, and has been made by using a laser generator attached to a vibration table.
By irradiating the scale plate attached to the upper part of the housing with a laser beam that has straightness and sharp directivity, the displacement of the upper part of the housing can be measured more accurately. For the purpose of providing.

[0012]

According to a first aspect of the present invention, there is provided a laser light displacement measuring apparatus for vibration test according to the present invention, wherein a vibration is applied to a housing or the like in a one-dimensional direction. A vibration table for performing a vibration test of a body, a laser generator mounted on the vibration table, and a scale mounted on a displacement measuring unit such as the housing and irradiated with laser light from the laser generator And a measuring means for measuring the position of the image of the laser light applied to the scale plate. With this configuration, the image of the laser light applied to the scale plate does not vibrate with respect to the vibration table even if the vibration table is vibrated. By measuring, the vibration displacement of the housing can be accurately measured.

According to a second aspect of the present invention, in the laser light displacement measuring device for vibration test according to the first aspect, the scale plate is mounted in the same direction as the vibration direction, and the laser generator is mounted on the scale plate. In the front direction. In this way, the vibration displacement of the image 3 of the laser light with respect to the scale plate can be measured as the vibration displacement of the housing with respect to the vibration direction of the shaking table, and the image of the laser light of the scale plate can be recognized vertically. It can be an easy image.

According to a third aspect of the present invention, there is provided a laser beam displacement measuring apparatus for vibration test, wherein the laser generator is mounted on a vibration table for performing a vibration test on a housing or the like in a two-dimensional vibration direction orthogonal to the vibration generator. And a scale attached to a displacement measurement unit such as the housing, and a scale plate to which laser light from the laser generator is irradiated, and a measuring unit for measuring a position of an image of the laser light applied to the scale plate. Wherein the scale plate is mounted in the same direction as the respective vibration directions, and the laser generator is mounted in the front direction of the scale plate. In this way, even if the housing vibrates two-dimensionally,
Vibration displacement in each vibration direction can be accurately measured.

According to a fourth aspect of the present invention, there is provided a laser light displacement measuring device for vibration test, which is mounted on a vibration table for performing a vibration test on a housing or the like in a two-dimensional vibration direction orthogonal to the vibration generator. And a scale plate attached to a displacement measuring unit such as the housing and provided with two scales orthogonal to each other and irradiated with laser light from the laser generator, and a laser beam irradiated on the scale plate. Measuring means for measuring the position of the image, wherein the scale plate is mounted in parallel with the upper surface of the shaking table, and the laser generator is mounted directly below the scale plate. Thus, the trajectory of the two-dimensional vibration of the housing can be detected on the scale plate, so that the vibration state of the housing can also be measured.

According to a fifth aspect of the present invention, in the vibration test laser light displacement measuring device according to any one of the first to fourth aspects, a plurality of the laser oscillators are provided for a plurality of the displacement measuring units. The scale plate is attached. Accordingly, the vibration displacement of each vibration mode of the housing can be measured, so that the vibration state of the housing can be accurately measured.

According to a sixth aspect of the present invention, in the vibration test laser light displacement measuring apparatus according to any one of the first to fifth aspects, the measuring means is a CCD camera. As described above, the position of the image of the laser beam with respect to the scale plate can be easily measured by using the CCD camera.

According to a seventh aspect of the present invention, in the laser light displacement measuring device for vibration test according to any one of the first to sixth aspects, the measuring means is the scale plate which is sensitive to the laser light. There is a configuration. Thereby, the position of the image of the laser beam with respect to the scale plate can be directly measured, so that the vibration displacement can be measured more accurately and more easily.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a laser beam displacement measuring device for a vibration test according to a first embodiment of the present invention will be described with reference to the drawings. 1A and 1B are schematic diagrams of a laser light displacement measuring device for vibration test in the first embodiment, wherein FIG. 1A is a front view, and FIG. 1B is a side view. In the figure,
The laser light displacement measuring device for vibration test comprises a laser generator 3, a scale plate 4, and a CCD camera 5.

The rectangular parallelepiped housing 2 is placed substantially at the center of the vibration table 1 so that the side surface of the case 2 is in the same direction as the vibration X direction of the vibration table 1. Is fixed to the vibration table 1. By doing so, the vibration direction of the housing 2 and the vibration direction of the scale plate 4 become the same, so that the vibration displacement of the housing 2 and the vibration displacement of the scale plate 4 become equal, and the vibration displacement of the housing 2 Measurement becomes easy.

The scale plate 4 has a structure of a rectangular flat plate, and is attached to the upper side surface of the housing 2 in the same direction as the vibration X direction with a double-sided tape or the like. Here, preferably, when the upper side surface of the housing 2 is flat, the scale plate 4
Can be a tape with a scale. By doing so, the adverse effect of the weight of the scale plate 4 can be reduced.

The laser generator 3 is movably fixed to the excitation table 1 in the front direction of the scale plate 4 and irradiates the scale plate 4 with a laser beam 3a which is straight and has a sharp directivity. By attaching the laser generator 3 in the front direction of the scale plate 4 as described above, the image 3b of the laser beam 3a can be made a vertically long image, so that the recognizability of the image 3b can be improved.

The CCD camera 5 is installed almost in front of the scale plate 4 and separately from the vibration table 1.
Record the position of b. By doing so, the image 3
b and the image of the scale plate 4 can be easily photographed. In addition, since the CCD camera 5 is not installed on the vibration table 1, there is no danger that the CCD camera 5 is displaced by the vibration of the vibration table 1 and cannot be measured due to a measurement error.

The operation of the above-described laser light displacement measuring device for vibration test will be described below. The laser light 3a emitted from the laser generator 3 attached to the vibration table 1
Even if the vibration table 1 vibrates with the vibration X, the position of the image 3b on the scale plate 4 does not change at all if the housing 2 is assumed to be a rigid body. That is, the displacement measuring column 40 used in the conventional example
When the vibration table 1 vibrates with the vibration X, the displacement measuring column 40 vibrates with respect to the vibration table 1, and this vibration displacement causes a measurement error, whereas the laser beam 3a is Even if 1 vibrates with the vibration X, the image 3b does not vibrate with respect to the vibration table 1, so that a measurement error does not occur and an accurate vibration displacement can be measured.

If the vibrating table 1 vibrates with the vibration X and the upper part of the housing 2 vibrates with the vibration X1 with respect to the vibrating table 1, the image 3b will move with respect to the scale plate 4. It vibrates at X1, and this state is recorded by the CCD camera 5, and by performing slow reproduction, the vibration displacement of the vibration X1 can be measured. Here, the CCD camera 5
Is stationary on the outside of the excitation table 1, so CC
The image recorded on the D camera 5 is such that when the vibration table 1 vibrates with the vibration X and the upper part of the housing 2 vibrates with the vibration X1,
The scale plate 4 vibrates with the vibration X, and the image 3b becomes an image vibrating with the vibration X + X1.

As described above, the vibration displacement of the housing 2 can be measured more accurately by using the laser generator 3 according to the laser light displacement measuring device for vibration test of the first embodiment. Further, when performing a vibration test on the housings 2 having different shapes and sizes, the mounting position of the laser generator 3 can be freely moved, so that the switching operation can be easily performed.

Hereinafter, a laser light displacement measuring device for vibration test according to a second embodiment of the present invention will be described with reference to the drawings. 2A and 2B are schematic views of a vibration test laser light displacement measuring device according to a second embodiment, in which FIG. 2A is a front view and FIG. 2B is a side view. In the figure, the laser light displacement measuring device for vibration test is composed of a plurality of laser generators 3 and a scale plate 4a.

The vibration table 1 vibrates with a vibration X and a vibration Y in a direction perpendicular thereto. That is, the vibration table 1 vibrates two-dimensionally. Further, the rectangular parallelepiped casing 2 is placed substantially at the center of the vibration table 1 so that the side surface of the case 2 is in the same direction as the vibration X direction of the vibration table 1, and the bottom surface is It is fixed to the vibration table 1. Therefore, the direction of the side surface of the housing 2 perpendicular to this side surface is the same as the vibration Y direction of the vibration table 1.

A scale plate 4a made of a square flat plate is adhered to the upper and middle side surfaces of the casing 2 parallel to the vibration X direction with a double-sided tape or the like.
A scale plate 4a is similarly adhered to the upper and middle side surfaces of the device with double-sided tape or the like. As described above, by attaching the scale plate 4a to the center in the height direction of the housing 2 and measuring the vibration displacement, for example, when the housing 2 is elongated,
As for the vibration mode of the housing 2, the vibration displacement can be measured.

On the surface of the scale plate 4a, a photosensitive paper sensitive to a laser beam 3a having two orthogonal scales is attached. Therefore, the scale plate 4 a
The image 3b of a can be measured directly. In this way, since the image 3b can be directly recorded on the scale plate 4a, the risk of a measurement error occurring when measuring the position of the image 3b with respect to the scale plate 4a can be reduced. Further, by providing two scales orthogonal to the scale plate 4, the vibration amplitude can be measured not only for the vibration X1 of the housing 2 in the same direction as the vibration X but also for the vibration displacement of the vibration orthogonal to the vibration X. .

Each laser generator 3 has a vibration X or a vibration Y
The scale plate 4a is movably fixed to the vibrating table 1 in the front direction of each scale plate 4a attached corresponding to the vibration direction, and irradiates the scale plate 4 with a laser beam 3a having straightness and sharp directivity. By attaching in this manner, the laser beam 3a
The image 3b irradiated on the scale plate 4 can be a vertically long image, which can be easily recognized. Other structures are the same as in the first embodiment.

The operation of the above-described laser light displacement measuring device for vibration test will be described below. The laser light 3a emitted from the laser generator 3 attached to the vibration table 1
Even if the vibration table 1 vibrates with the vibration X and the vibration Y, the respective images 3b do not vibrate with respect to the vibration table 1, so that no measurement error occurs for each vibration component with respect to the vibration X and the vibration Y. , Accurate vibration displacement can be measured. Also, since the vibration table 1 vibrates two-dimensionally, the vibration X
By attaching the scale plate 4a to the displacement measurement unit corresponding to the vibration Y, the vibration displacement of each displacement measurement unit can be measured by one vibration test.

Since the scale 4a is also attached to the center of the housing 2 in the height direction to measure the vibration displacement, the vibration state can be accurately measured for each vibration mode of the housing 2. can do. In other words, the primary vibration mode for the vibration X of the housing 2 is a mode in which the vibration becomes larger toward the upper part of the housing 2, and the amplitude of the vibration X1 is larger than the amplitude of the vibration X2. Further, in the secondary vibration mode, the vibration at the central portion in the height direction of the housing 2 is large, and the amplitude of the vibration X2 is larger than the amplitude of the vibration X1. The same applies to the vibration Y.

The laser beam 3a is applied to the surface of the scale plate 4a.
By sticking a photosensitive paper which is exposed to the camera, the displacement can be measured directly rather than measuring the displacement from the video data recorded in the CCD camera 5, so that more accurate measurement of the vibration displacement can be performed. Since the measurement operation is simplified, the measurement time can be reduced. Also, by providing two scales perpendicular to the scale plate 4a,
The vibration state of the housing 2 can be measured more accurately.

As described above, according to the vibration test laser beam displacement measuring apparatus of the second embodiment, the two-dimensional vibration of the vibration table 1 is achieved by using the plurality of laser generators 3 and the scale plate 4a. In contrast, more accurate vibration displacement of the housing 2 can be measured, including the vibration state for the vibration mode. In addition, since the position of the image 3b does not need to be recorded using the CCD camera 5 by sticking the photosensitive paper on the surface of the scale plate 4a, the vibration displacement can be measured more accurately, and the measurement time can be reduced. Can be shortened.

Hereinafter, a laser light displacement measuring device for vibration test according to a third embodiment of the present invention will be described with reference to the drawings. 3A and 3B are schematic diagrams of a vibration test laser beam displacement measuring device according to the third embodiment, where FIG. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a top view.
In the figure, a laser light displacement measuring device for vibration test is constituted by a laser generator 3 and scale plates 4b and 4c.

The rectangular parallelepiped casing 2 is placed substantially at the center of the vibration exciter 1 so that the vibration X direction of the exciter 1 and the side of the casing 2 are in the same direction. The part is fixed to the vibration table 1. Further, the vibration table 1 vibrates with a vibration X and a vibration Y in a direction perpendicular to the vibration X. That is, the vibration table 1 vibrates two-dimensionally.

The scale plate 4b has a rectangular plate-like structure in which two orthogonal scales are attached to the lower surface of one end, and the scaled end protrudes outside the side surface of the housing 2. is there. Specifically, the scale plate 4b is adhered to the upper surface of the housing 2 with a double-sided tape or the like attached to the lower surface of the other end. A laser generator 3 is mounted on the upper surface of the excitation table 1 almost directly below the scale plate 4b.
Is applied to the scale plate 4b.

The scale plate 4c has a structure in which two perpendicular scales are attached to the lower surface of one end and the other end of a rectangular flat plate is bent at a right angle. The upper surface of the housing 2 is adhered to the side surface of the central portion in the height direction of the housing 2 with a double-sided tape or the like attached to the other bent end portion. A laser generator 3 is mounted on the vibrating table 1 almost directly below the scale plate 4c so that the scale plate 4b is irradiated with a laser beam 3a. Other structures are the same as those of the second embodiment.

The operation of the above-described laser light displacement measuring device for vibration test will be described below. Scale plates 4b and 4c
The laser generators 3 mounted substantially parallel to the upper surface of the vibrating table 1 and mounted immediately below these are
Since the scale plates 4b, c are irradiated with the laser beam 3a substantially perpendicularly, the images 3b on the scale plates 4b, c are expressed as the vibration displacement of the housing 2 with respect to the vibration X and the vibration Y, respectively.
Will be recorded. That is, the trajectories of the vibrations of the upper part and the central part of the housing 2 are two-dimensionally recorded on the scale plates 4b and 4c, and each vibration displacement can be easily and accurately measured.

As described above, according to the laser light displacement meter for vibration test of the third embodiment, the scale plates 4b and 4c having two orthogonal scales are set so as to be parallel to the upper surface of the vibration table 1. The laser beam 3a is attached to the housing 2 and the scale plates 4b and 4c
, The vibration displacement of the housing 2 with respect to the two-dimensional vibration composed of the vibration X and the vibration Y can be two-dimensionally recorded and measured.

In each of the above-described embodiments, the present invention is configured and described under specific conditions. For example, instead of a photosensitive paper for directly recording a laser beam image on a scale plate, a photosensitive paint is used. A scale plate coated with such as can be used.

[0043]

As described above, according to the present invention,
The laser generator is mounted on a vibration test shaking table, and the vibration displacement of the housing can be accurately measured by the straightness of the laser light. In addition, the work of attaching the scale plate to the housing and the work of adjusting and fixing the laser generator so that the laser beam forms an image on the scale plate are both easy, so that the vibration displacement measurement of the housing can be performed easily and easily. It can be done in a short time. In addition, by using a scale plate that is sensitive to a laser beam and can directly record an image of the laser beam, the vibration displacement of the housing can be measured more accurately and in a short time.

[Brief description of the drawings]

FIG. 1 is a schematic view of a vibration test laser light displacement measuring device according to a first embodiment, where (a) is a front view,
(B) shows a side view.

FIG. 2 is a schematic diagram of a vibration test laser beam displacement measuring device according to a second embodiment, where (a) is a front view,
(B) shows a side view.

FIG. 3 is a schematic view of a vibration test laser light displacement measuring device according to a third embodiment, where (a) is a front view,
(B) is a side view, and (c) is a top view.

FIG. 4 is a schematic view of a displacement measuring device on an upper portion of a housing in a vibration test of a conventional example, where (a) is a front view,
(B) shows a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exciting table 2 Housing 3 Laser generator 3a Laser beam 3b Image 4 Scale plate 4a Scale plate 4b Scale plate 4c Scale plate 5 CCD camera 21 Pointing member 40 Displacement measuring column 41 Scale 42 Beam

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F065 AA09 AA19 BB05 BB29 CC00 DD06 FF04 FF61 GG04 GG13 HH04 HH12 HH13 JJ00 JJ03 JJ09 JJ26 PP12 QQ00 QQ24

Claims (7)

[Claims] 1. A vibration table for applying vibration in a one-dimensional direction to a case or the like to perform a vibration test on the case or the like; a laser generator attached to the vibration table; A scale plate attached to a displacement measuring unit and irradiated with laser light from the laser generator, and a measuring unit for measuring a position of an image of the laser light irradiated on the scale plate. Laser displacement measurement device for vibration test. 2. The laser beam displacement measuring device for vibration test according to claim 1, wherein the scale plate is mounted in the same direction as the vibration direction, and the laser generator is positioned in front of the scale plate. A laser light displacement measuring device for a vibration test, which is attached. 3. A laser generator attached to a vibrating table for performing a vibration test of a housing or the like in a two-dimensional vibration direction orthogonal to the first direction, and a laser generator attached to a displacement measuring unit of the housing or the like, A scale plate irradiated with laser light from a generator, and measuring means for measuring a position of an image of the laser light irradiated on the scale plate, wherein the scale plate is arranged in the same direction as each of the vibration directions. A laser light displacement measuring device for a vibration test, wherein the laser generator is mounted in the front direction of the scale plate. 4. A laser generator attached to a vibrating table for performing a vibration test on a housing or the like in a two-dimensional vibration direction orthogonal to the vibration source; A scale plate provided with two scales orthogonal to each other to be irradiated with laser light from a generator, and measuring means for measuring a position of an image of the laser light applied to the scale plate, wherein the scale plate Is mounted in parallel with the upper surface of the shaking table, and the laser generator is mounted directly below the scale plate. 5. The laser beam displacement measuring device for vibration test according to claim 1, wherein a plurality of said laser oscillators and said scale plate are attached to a plurality of said displacement measuring units. A laser displacement meter for vibration tests. 6. The laser light displacement measuring device for vibration test according to claim 1, wherein said measuring means is a CCD camera. apparatus. 7. The laser beam displacement measuring device for vibration test according to claim 1, wherein said measuring means is said scale plate which is sensitive to said laser beam. Laser light displacement measuring device for vibration test.